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Phoenix, AZ (Sports Network) - Stacy Lewis closed strong and took advantage of a costly mistake by Ai Miyazato on Sunday to take a 3-stroke victory at the RR Donnelley LPGA Founders Cup.

Lewis fired an 8-under 64 to finish the tournament at 23-under-par 265 and capture her seventh career LPGA victory.

Miyazato entered the day with a 4-stroke lead. Lewis was charged with a 2- stroke penalty at the end of Saturday's round for her caddie testing the surface of a bunker. She managed just a 1-under 71 in her final round at Wildfire Golf Club at JW Marriott Phoenix Desert Ridge Resort & Spa to take second place at 20-under-par 268.

With the win, Lewis overtook Yani Tseng for the No. 1 ranking in the world, becoming the first American since Cristie Kerr in Oct. 2010 to hold the spot.

Angela Stanford (68) sat alone in third place at 17-under, while Jessica Korda (66), Giulia Sergas (68), Lizette Salas (69) and Jee Young Lee (71) shared fourth at 16-under.

MORE TO FOLLOW.